Split-point and 135-degree twist design increases cutting speed with self-centering and prevents walking, removes chips and particles faster M2 high-speed steel bits with titanium nitride coating for increased durability p> Special left-hand design can also be used with screw extractors to remove broken fasteners Can be attached to reversible drills to remove screws, bolts and studs around the home, garage or on the job site< /p> Set includes: 1/16, 5/64, 3/32, 7/64, 1/8, 9/64, 5/32, 11/64, 3/16, 13/64, 7/32, 15/64 and 1/4 inch bits; Comes in a metal case for easy storage